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Method for butylenes double-bond isomerization

A technology for double bond isomerization and butene, which is used in isomerization to produce hydrocarbons, organic chemistry, etc., can solve the problems of poor catalyst stability, low yield and selectivity of target products, and short life, and achieve good catalytic activity. , The effect of good product selection performance and shortened regeneration cycle

Active Publication Date: 2008-02-13
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the problems of poor catalyst stability, short service life, low yield and selectivity of the target product in the previous literature technology, and provide a new method for isomerization of butene double bonds

Method used

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  • Method for butylenes double-bond isomerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～10

[0017] According to the molar ratio of silicon to aluminum SiO 2 / Al 2 o 3 Configure a slurry containing silicon, aluminum, template (n-butylamine) and water at a ratio of 200, and the molar ratio of the raw materials is 150 SiO 2 :Al 2 o 3 : 50 n-butylamine: 17OH-: 200NaCl: 6300H 2 O was stirred at room temperature for 15 hours. Then crystallize at a temperature of 140° C. for 50 hours, and then wash, dry and roast the crystallization solution to obtain ZSM-5 molecular sieve. Add 50 grams of ZSM-5 molecular sieves to 87 grams of 40% (weight) silica gel, mix, extrude, dry at 130°C, and roast at 430°C to prepare a ZSM-5 catalyst.

[0018] The above-mentioned ZSM-5 molecular sieve catalyst is packed into a fixed-bed reactor, and the refinery raffinate II is used as a raw material (n-butane 17.8%, cis-2-butene 22.2%, trans-2-butene 60%), 3 hours at airspeed -1 , the pressure is normal pressure, the reaction results of isomerization of butene-2 ​​to butene-1 at different r...

Embodiment 11～20

[0022] According to each step of embodiment 1, silicon aluminum molar ratio SiO is obtained 2 / Al 2 o 3 Be the ZSM-5 type molecular sieve catalyst of 450, adopt refinery raffinate II to be raw material (n-butane 17.8%, cis-2-butene 22.2%, trans-2-butene 60%), at a temperature of 320 hours -1 , under the condition of 0.1MPa pressure, the reaction results of isomerization of butene-2 ​​to butene-1 under different reaction space velocity conditions are shown in Table 2:

[0023] Table 2

[0024] serial number

Embodiment 21

[0026] According to the various steps and operating conditions of Example 1, the silicon-aluminum molar ratio SiO 2 / Al 2 o 3 ZSM-5 molecular sieve catalyst of 50, using pure butene-1 as raw material, at a temperature of 100°C and a space velocity of 2 hours -1 , under the condition of 0.1 MPa, the reaction result of isomerization of butene-1 to butene-2: the conversion rate of butene-1 is 92.1.3%, and the yield of butene-2 ​​is 91.2%.

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Abstract

The invention relates to a method for isomerizing butene double bonds. It mainly solves the technical problems of narrow application range of raw materials and short catalyst regeneration period existing in the prior art. The present invention solves this problem well by adopting the technical scheme of contacting the raw material containing butene with the molecular sieve catalyst to generate the effluent containing the molar ratio of butene-1 and butene-2 ​​close to the thermodynamic equilibrium value, and can be used for butene In the industrial production of double bond isomerization.

Description

technical field [0001] The invention relates to a method for isomerizing butene double bonds, in particular to a method for isomerizing butene-2 ​​and butene-1 double bonds. Background technique [0002] 1-butene is a chemically active α-olefin. High-purity 1-butene is mainly used as a comonomer in the production of linear low-density polyethylene (LLDPE). LLDPE has good high-temperature creep properties, High impact strength, heat resistance and wear resistance, especially suitable for hot water pipes, so it has become a thermoplastic polymer material that has grown rapidly in recent years; at the same time, other oligomerization products of 1-butene, such as dimer 1 -Octene and trimer dodecene can replace 1-butene to synthesize better LLDPE and HDPE, and can also be widely used in automotive and lubricating oil additives, synthetic detergents, surfactants and plasticizers, Printing and dyeing agents, emulsifiers, etc., have a wide range of uses, and their usage is increas...

Claims

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Application Information

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IPC IPC(8): C07C5/25C07C11/08
Inventor 杨为民刘俊涛张惠明钟思青
Owner CHINA PETROLEUM & CHEM CORP
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